'Herd immunity is an elusive concept and doesn't apply to coronavirus,' says Dr. Don Milton at the University of Maryland School of Public Health.
Experts say it's not likely that the highly transmissible variant — or any other variant — will lead to herd immunity.
Herd immunity is when enough of a population is immune to a virus that it's hard for the germ to spread to those who aren't protected by vaccination or a prior infection. Then there's the huge variation in vaccinations. In some low-income countries, less than 5% of the population is vaccinated. Rich countries are struggling with vaccine hesitancy. And young children still aren't eligible in many places.
Many scientists believe COVID-19 will eventually become like the flu and cause seasonal outbreaks but not huge surges.
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